We have two new users I set them up in AD like anybody else. They have no problem to send/receive inbound email as well as send outbound email. But they are having problem to receive outboud email! I sent a few email from my yahoo email account and got : Sorry, we were unable to deliver your message to the following address.
Remote host said: 550 No such user - psmtp [RCPT_TO]
Received: from [22.214.171.124] by nm27.bullet.mail.ac4.yahoo.com with NNFMP; 05 Oct 2011 15:40:15 -0000
Received: from [126.96.36.199] by tm9.bullet.mail.ac4.yahoo.com with NNFMP; 05 Oct 2011 15:40:15 -0000
Received: from [127.0.0.1] by omp1069.mail.ac4.yahoo.com with NNFMP; 05 Oct 2011 15:40:15 -0000
Received: (qmail 3634 invoked by uid 60001); 5 Oct 2011 15:40:15 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1317829215; bh=7IKDjumCGXw6a8Bp5eyJbVBvgJQIg8vgh93TlElJMTg=; h=X-YMail-OSG:Received:X-Mailer:Message-ID:Date:From:Subject:To:MIME-Version:Content-Type; b=B1AxaEDdba5lnynb9ZXfAgc4DJHYI0TOY3SpQKE6txdDCbvG0VAhkEEpnRI4QEYkKU4TwpCP5chWP5obPTTvDrKiAXiqJOFVXgU+Tk0qHcEopkztIBihI/2tzWzgv100hon6vFZDKswMA5FMnrGaWvSzFCFqm8yR3H4XutYL+Cw=
DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws;
The error message is longer than above and I just copied some. By the way other users can be able to receive outboud email. We are using exchang2003 and Outlook 2007.
Can someone help me please?
Thank you very much in advance!